We search for single-photon decays of the Gamma(1S) resonance, Gamma -> gamma + invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A(0), or a pair of dark matter particles, chi(chi) over bar. Both A(0) and chi are assumed to have zero spin. We tag Gamma(1S) decays with a dipion transition Gamma(1S) -> pi(+)pi Y-(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m(A0) <= 9.2 GeV and m(chi) <= 4.5 GeV in the sample of 98 x 10(6) Gamma(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.

Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S) / Sanchez P., d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., Milanes, D.A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Brown, D.N., Chistiakova, M.V., Jensen, F., Kerth, L.T., Kolomensky Yu, G., Lynch, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 107:2(2011). [10.1103/PhysRevLett.107.021804]

Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S)

CARPINELLI, Massimo;
2011-01-01

Abstract

We search for single-photon decays of the Gamma(1S) resonance, Gamma -> gamma + invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A(0), or a pair of dark matter particles, chi(chi) over bar. Both A(0) and chi are assumed to have zero spin. We tag Gamma(1S) decays with a dipion transition Gamma(1S) -> pi(+)pi Y-(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m(A0) <= 9.2 GeV and m(chi) <= 4.5 GeV in the sample of 98 x 10(6) Gamma(2S) decays collected with the BABAR detector and set stringent limits on new physics models that contain light dark matter states.
2011
Search for Production of Invisible Final States in Single-Photon Decays of Gamma(1S) / Sanchez P., d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., Milanes, D.A., Palano, A., Pappagallo, M., Eigen, G., Stugu, B., Sun, L., Brown, D.N., Chistiakova, M.V., Jensen, F., Kerth, L.T., Kolomensky Yu, G., Lynch, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 107:2(2011). [10.1103/PhysRevLett.107.021804]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/86442
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